Best Tankless Water Heater WiFi: Smart On‑Demand Hot Water for Modern Homes
Smart, WiFi-enabled tankless water heaters bring on-demand hot water with remote control, energy efficiency, and space savings. This guide highlights five top models that balance power, install needs, and smart features for American homes. Each product supports remote temperature management, durable build quality, and real-time status monitoring to help you pick the best option for your family’s hot water needs.
Summary of selected products:
| Product | Brand | Hot Water Output (GPM) | Smart Features |
|---|---|---|---|
| Electric Tankless Water Heater WINTEMP 27kW | WINTEMP | Up to 6.5 | WiFi control, LED temperature display |
| Westinghouse 14kW APOLO-14kW | Westinghouse | Up to 3.38 | Smart WiFi, Alexa & Google Home, LED status |
| WINTEMP 36kW Tankless Electric | WINTEMP | Up to 8.7 | WiFi control, LED display |
| Rinnai RX199iN Condensing | Rinnai | Up to 11.1 | Smart Sense control, Versa Vent compatibility |
| Westinghouse 14kW 240V Tankless | Westinghouse | Up to 3.38 | Smart WiFi, Alexa & Google Home, LED |
Electric Tankless Water Heater WINTEMP 27kW
The WINTEMP 27kW unit is designed for whole-house hot water supply with on-demand performance. It runs at 240V and uses self-regulating technology to maintain a stable output while adjusting power based on flow and incoming water temperature. With a maximum output near 6.5 GPM, it supports multiple points of use in typical residential layouts. The LED temperature display provides at-a-glance monitoring, and WiFi control enables remote adjustments, status checks, and scheduling to enhance daily comfort and energy management. Installation requires careful attention to electrical capacity, including three 40-amp double-pole breakers and appropriate wiring, as noted in the specifications. This model targets 2–4 usage points and emphasizes energy savings by reducing power input when water flow decreases.
Westinghouse 14kW APOLO-14kW
Westinghouse APOLO-14kW is a compact electric tankless heater designed for quick, on-demand hot water. It supports up to 3.38 GPM with an activation flow of 0.5 GPM and is compatible with a 60-amp double-pole breaker and 6 AWG wiring. The unit provides continuous hot water for one shower and one sink simultaneously, helping to eliminate temperature fluctuations during use. Smart WiFi enables remote temperature control from 86°F to 140°F, and the LED display offers real-time status updates for easy monitoring and quick troubleshooting in busy households.
WINTEMP 36kW Tankless Electric Water Heater
The WINTEMP 36kW model delivers higher flow rates for larger homes or higher simultaneous hot water demand, with up to 8.7 GPM. It operates at 240V and requires a robust electrical setup (four 40-amp double-pole breakers and four 8/2 AWG cables). A recommended 300A household power supply supports the unit’s peak load. Like its smaller sibling, this model uses self-regulating technology to optimize energy use and maintain temperature stability, reducing waste and improving efficiency for households with multiple baths, laundry, and extensive hot water needs.
NEW Rinnai RX199iN Condensing
The Rinnai RX199iN is a versatile condensing gas-powered tankless system that can be installed indoors or outdoors with Versa Vent accessories. It delivers up to 11.1 GPM and supports propane or natural gas, making it suitable for larger homes with high simultaneous hot water needs. Its Smart Sense gas control ensures efficient operation, while a Quick Flush feature streamlines maintenance. The system is designed for compact installation footprints and high reliability, though WiFi control is available via a separate module, not included with the base unit. This model appeals to households prioritizing gas-powered efficiency and flexibility in placement.
Westinghouse 14kW 240V Tankless
This 14kW Westinghouse model provides dependable on-demand hot water with smart WiFi and voice-control capabilities through Alexa and Google Home. The unit dimensions and installation requirements align with standard 240V electrical setups, using a 60-amp DP breaker and 6 AWG cable. It supports up to 3.38 GPM, making it suitable for a single shower and one sink at once. The LED display and remote monitoring features help homeowners set precise temperatures and monitor performance, reducing wait times and temperature swings during daily routines.
APUS Natural Gas Tankless Water Heater 140,000 BTU
APUS offers a gas-powered tankless option with 140,000 BTU and a maximum of 6.8 GPM. It promises instant hot water with its exclusive single-circulation technology and ECO smart cycle that reduces energy use by up to 40% compared with conventional heaters. A built-in booster pump can increase water flow by up to 130%, supporting two simultaneous showers and two sinks. The device emphasizes rapid response, stable temperatures, and flexible indoor or outdoor installation through accessory kits, making it suitable for evolving home layouts and larger families seeking robust on-demand hot water.
Rheem RTG-95DVELN-3 With WiFi
The Rheem RTG-95DVELN-3 offers high efficiency and up to 9.5 GPM, making it well-suited for 2–3 bathroom homes. Its 199,900 BTU natural gas input ensures rapid hot water availability during peak demand. Indoor installation and a compact cabinet simplify mounting, while WiFi-enabled controls enable remote temperature adjustments and monitoring, supporting a convenient and responsive hot water experience for households with multiple simultaneous uses.
MIZUDO Natural Gas Tankless Water Heater Gen 3
MIZUDO’s generation 3 natural gas tankless heater supports an indoor or outdoor installation with flexible configurations. It delivers up to 5.1 GPM at 120,000 BTU and includes WiFi and app control for temperature settings, energy monitoring, and maintenance alerts. The model emphasizes stable output during multi-fixture usage, helping to prevent temperature fluctuations while maximizing efficiency. It is positioned as a versatile solution for large families seeking reliable hot water with modern connectivity.
Buying Guide: Key Considerations for WiFi Tankless Water Heaters
- Fuel type and availability: Electric units offer simplicity and clean operation but require sufficient electrical capacity. Gas models deliver higher GPM and are ideal for larger households but need venting and gas supply considerations.
- GPM needs: Estimate peak simultaneous usage (showers, sinks, laundry). Choose a model that meets or exceeds your calculated GPM to avoid temperature drops.
- Electrical and venting requirements: Electric models may require multi-breaker setups and heavy gauge wiring. Gas models need proper venting and clearance, plus gas line support.
- Smart features and app control: WiFi connectivity enables remote temperature management, monitoring, and maintenance alerts. Check compatibility with your smart home ecosystem (Alexa, Google Home, etc.).
- Space and installation: Tankless units are compact, but some require dedicated mounting space and ventilation for gas models. Measure clearance and service access for maintenance.
- Energy efficiency and long-term savings: Self-regulating or modulating technologies improve efficiency, reduce energy use, and lower operating costs over time, especially in homes with variable hot water demand.
- Maintenance and serviceability: Look for features like quick flush or easy access for routine maintenance. Consider availability of service networks and replacement parts in your area.
- Electrical load considerations: For electric models, ensure your home’s electrical panel can accommodate the additional load or plan for service upgrades with a licensed electrician.
Selecting a WiFi-enabled tankless water heater involves balancing output capabilities, installation constraints, and smart features. The models featured here offer a range of capacities and control options to fit various home sizes, budgets, and connectivity preferences. Always verify local electric or gas codes, as well as the suitability for indoor or outdoor placement, before purchasing and installation.